CN112887944A - Physical layer cross-technology communication method and device - Google Patents
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- H—ELECTRICITY
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- H04W4/80—Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
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- H—ELECTRICITY
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- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/30—Definitions, standards or architectural aspects of layered protocol stacks
- H04L69/32—Architecture of open systems interconnection [OSI] 7-layer type protocol stacks, e.g. the interfaces between the data link level and the physical level
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Abstract
The invention discloses a physical layer cross-technology communication method and a physical layer cross-technology communication device, which are used for realizing direct communication from ZigBee to BLE, and the method comprises the following steps: receiving a ZigBee signal; splitting the ZigBee signal into a plurality of signal segments, wherein the signal segments comprise anti-offset segments. Identifying the law of the anti-offset fragment and determining a decoding algorithm according to the law of the anti-offset fragment; decoding the ZigBee signal according to the decoding algorithm; and identifying the decoded ZigBee signal. According to the method, a ZigBee signal is divided into a plurality of signal segments, the signal segments comprise anti-offset segments, and the law of the anti-offset segments is identified so as to obtain a decoding algorithm; by using the decoding algorithm, the ZigBee symbol can be decoded with very low processing complexity, and meanwhile, very high decoding precision is realized. The invention can be widely applied to the technical field of communication of the Internet of things.
Description
Technical Field
The invention belongs to the technical field of communication of the Internet of things, and particularly relates to a physical layer cross-technology communication method and device.
Background
Currently, cross-technology communication (CTC) methods for implementing direct communication between heterogeneous devices are largely divided into two categories, one being data packet-level CTCs, which use packet-level information to implement cross-technology message delivery; another class is physical layer CTC, which utilizes physical layer information to enable communication of cross technology messages; the physical layer CTC at the receiver end shifts the processing complexity to the receiver. LEGO-Fi and XBee are two typical representatives of a receiver-end CTC, and the two representatives respectively realize direct communication from ZigBee to WiFi and from ZigBee to BLE; both schemes introduce additional software-defined modules into their receivers for decoding, except for reusing the standard modules of their respective receivers. However, both schemes use an exhaustive correlation method for decoding, ZigBee defines 16 non-orthogonal symbols to convey information, and both schemes correlate a received symbol with each of 16 defined symbols whenever a ZigBee symbol is received, and treat the symbol corresponding to the largest correlation value as the received symbol; therefore, the processing complexity of this exhaustive decoding method is high; furthermore, the final decoding result is susceptible to noise due to non-orthogonality of ZigBee symbols and heterogeneity of transmitters and receivers.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a physical layer cross-technology communication method and a physical layer cross-technology communication device.
The technical scheme adopted by the invention is as follows:
on one hand, an embodiment of the present invention includes a physical layer cross-technology communication method for implementing direct communication from ZigBee to BLE, including:
receiving a ZigBee signal;
dividing the ZigBee signal into a plurality of signal segments, wherein the signal segments comprise anti-offset segments;
identifying the law of the anti-offset fragment and determining a decoding algorithm according to the law of the anti-offset fragment;
decoding the ZigBee signal according to the decoding algorithm;
and identifying the decoded ZigBee signal.
Further, the step of determining a decoding algorithm according to the rule of the anti-migration fragment specifically includes:
checking each signal segment of the ZigBee signal to obtain an anti-offset segment;
acquiring the index, the phase and the quadrant of the anti-offset fragment;
and determining a decoding algorithm according to the index, the phase and the quadrant of the anti-offset fragment.
Further, the step of decoding the ZigBee signal according to the decoding algorithm specifically includes:
sampling the received ZigBee signal to obtain a sampling sample;
processing the sampled ZigBee signal to obtain phase shift data;
and decoding the ZigBee signal by using the sampling sample and the phase shift data according to the decoding algorithm.
On the other hand, the embodiment of the invention also comprises a physical layer cross-technology communication device, and the device is used for executing the physical layer cross-technology communication method.
Further, the apparatus comprises:
the BLE quadrature demodulator module is used for sampling the received ZigBee signal to obtain a sampling sample;
and the BLE phase shift module is used for processing the sampled ZigBee signal to obtain phase shift data.
On the other hand, the embodiment of the invention also comprises a physical layer cross-technology communication method, which comprises the following steps:
and transmitting a ZigBee signal to the physical layer cross-technology communication device in the embodiment.
Further, before transmitting the ZigBee signal to the physical layer cross technology communication device according to the above-described embodiment, the method further includes:
modulating the ZigBee symbol into a ZigBee signal;
and amplifying the ZigBee signal.
Further, the step of modulating the ZigBee symbol into a ZigBee signal specifically includes:
converting the ZigBee symbol into a plurality of chip sequences by adopting a direct sequence spread spectrum technology;
and converting a plurality of the chip sequences into ZigBee signals by adopting an offset quadrature phase shift keying technology.
Further, the step of converting the plurality of chip sequences into the ZigBee signal by using the offset quadrature phase shift keying technique specifically includes:
selecting odd chips from the chip sequences to construct an in-phase sequence, and selecting even chips from the chip sequences to construct an orthogonal sequence;
converting the in-phase sequence into an in-phase signal and converting the quadrature sequence into a quadrature signal;
and delaying the orthogonal signal, and combining the delayed orthogonal signal with the in-phase signal to generate the ZigBee signal.
On the other hand, the embodiment of the present invention further includes a physical layer cross-technology communication apparatus, where the apparatus is configured to execute the physical layer cross-technology communication method described in the foregoing embodiment.
The invention has the beneficial effects that:
the method comprises the steps of segmenting a ZigBee signal into a plurality of signal segments, wherein the signal segments comprise anti-offset segments, and identifying the rule of the anti-offset segments to obtain a decoding algorithm; by using the decoding algorithm, the ZigBee symbol can be decoded with very low processing complexity, and meanwhile, very high decoding precision is realized.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
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The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic diagram of a currently employed data-clad cross-technology communication scheme;
FIG. 2 is a diagram of a current physical layer cross-technology communication scheme;
fig. 3 is a flowchart illustrating steps of a physical layer cross-technology communication method performed by a ZigBee transmitter according to an embodiment of the present invention;
fig. 4 is a schematic diagram illustrating a process of modulating a ZigBee symbol into a ZigBee signal according to an embodiment of the present invention;
figure 5 is a flowchart illustrating steps of a method for physical layer cross-technology communication performed by a BLE receiver according to an embodiment of the present invention;
figure 6 is a schematic diagram of a working flow of a BLE receiver according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a ZigBee symbol according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of a 12 th segment of a ZigBee symbol '1' according to an embodiment of the present invention;
FIG. 9 is a schematic diagram of a 12 th segment of a ZigBee symbol '9' according to an embodiment of the present invention;
FIG. 10 is a diagram of a 15 th segment of a ZigBee symbol '3' according to an embodiment of the present invention;
FIG. 11 is a diagram of a 15 th segment of a ZigBee symbol '11' according to an embodiment of the present invention;
fig. 12 is a schematic diagram of a decoding algorithm according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If there is a description of first and second for the purpose of distinguishing technical features only, this is not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of technical features indicated.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
The embodiments of the present application will be further explained with reference to the drawings.
First, the existing current cross-technology communication method is introduced, and cross-technology communication (CTC) methods for implementing direct communication between heterogeneous devices are mainly classified into two types.
One type is data overlay CTC, which uses packet-level information to enable communication of cross-technology messages; as shown in fig. 1, it may employ an energy level-based scheme (i.e., bits are transmitted by changing the energy level of a packet), or an inter-packet interval-based scheme (i.e., bits are transmitted by changing the transmission interval of a packet), or a packet reordering-based scheme (i.e., bits are transmitted by changing the transmission order of packets). This technique, however, requires the sender and receiver to modify their respective modulation and demodulation methods, which is not feasible for low-end (i.e., resource-constrained) IoT devices. And it also has inherent limitations in terms of data rate because each packet can only transmit a few bits at a time.
Another class is physical layer CTC, which utilizes physical layer information to enable communication of cross technology messages; in particular, it utilizes each physical layer symbol to transmit bits, so its throughput is much higher than the data-clad layer CTC. As shown in fig. 2, for conventional transmission, the transmitter feeds a bit sequence B into its transmitter hardware, where two operations T are passed1And T2After sequential processing (e.g., whitening and modulation), the bit sequence B is converted to a waveform W; for conventional reception, the receiver feeds the received waveform W into its receiver hardware, where the waveform W undergoes two operations R1And R2After sequential processing (e.g., demodulation and de-whitening), the sequence is decoded into a bit sequence.
Existing physical layer CTC designs can also be divided into two different schemes. The first is a transmitter-side scheme, the transmitter of which can simulate the waveform of the receiver so that the receiver can receive the signal as usual. The second is a receiver-side scheme in which the transmitter operates as usual, but the receiver adds some other software modules for directly decoding the transmitter's signal.
The physical layer CTC at the receiver end shifts the processing complexity to the receiver. For example, LEGO-Fi and XBee are two typical representatives of receiver-side CTCs, which enable ZigBee to WiFi and ZigBee to BLE direct communication, respectively. Both schemes introduce additional software-defined modules into their receivers for decoding, in addition to reusing the standard modules of their respective receivers. However, both schemes use an exhaustive correlation method for decoding. ZigBee defines 16 non-orthogonal symbols to convey information. Both schemes correlate the received symbol with each of the 16 defined symbols each time a ZigBee symbol is received, and treat the symbol (corresponding to the maximum correlation value) as the received symbol. Therefore, the processing complexity of this exhaustive decoding method is high. Furthermore, the final decoding result is susceptible to noise due to non-orthogonality of ZigBee symbols and heterogeneity of the transmitter and receiver.
Referring to fig. 3, an embodiment of the present invention includes a physical layer cross-technology communication method, which is performed by a ZigBee transmitter, and includes:
s100, transmitting a ZigBee signal to a BLE receiver.
Specifically, before transmitting the ZigBee signal to the BLE receiver, the method further includes:
s001, modulating the ZigBee symbol into a ZigBee signal;
and S002, amplifying the ZigBee signal.
Specifically, the step S001, that is, the step of modulating the ZigBee symbol into the ZigBee signal, specifically includes:
s001-1, converting the ZigBee symbol into a plurality of chip sequences by adopting a direct sequence spread spectrum technology;
and S001-2, converting a plurality of chip sequences into ZigBee signals by adopting an offset quadrature phase shift keying technology.
The step of modulating the ZigBee symbol into the ZigBee signal specifically comprises the following steps:
s001-a, converting the ZigBee symbol into a plurality of chip sequences;
s001-b, selecting odd chips from the chip sequences to construct an in-phase sequence, and selecting even chips from the chip sequences to construct an orthogonal sequence;
s001-c, converting the in-phase sequence into an in-phase signal, and converting the orthogonal sequence into an orthogonal signal;
and S001-d, delaying the orthogonal signal, and combining the delayed orthogonal signal with the in-phase signal to generate a ZigBee signal.
In this embodiment, an off-the-shelf ZigBee transmitter is used to transmit ZigBee symbols. The transmitter first modulates the ZigBee symbol into a ZigBee signal. It then amplifies and sends these signals to the BLE receiver. Specifically, the modulation process is as follows:
in modulation, according to the mapping table of fig. 4(a), the transmitter first converts the ZigBee symbol into a 32 chip sequence using a Direct Sequence Spread Spectrum (DSSS) technique, where one chip is a binary bit; then, it converts the 32-chip sequence into a ZigBee signal using offset quadrature phase-shift keying (OQPSK) technology. Referring to fig. 4(b), taking ZigBee symbol "0" as an example, the conversion process is explained in the following steps:
i) the transmitter selects odd and even chips of the 32 chip sequence to construct an in-phase sequence and a quadrature sequence, respectively.
ii) the transmitter converts the in-phase sequence and the quadrature sequence into an in-phase signal (as shown by the curve) and a quadrature signal (as shown by the dashed curve), respectively. Specifically, it converts each chip of the sequence into a half sine wave of length 1. If the chip is "1", the amplitude of the wave is positive, otherwise it is negative.
iii) the transmitter delays the quadrature signal by 0.5 and then combines it with the in-phase signal to generate the ZigBee signal.
In this embodiment, the ZigBee signal has a phase shift characteristic, specifically: the phase shift of the combined signal changes by | +/-/2 | every 0.5 μ s. As shown in fig. 4(c), when the time a is 0.5 μ s, the pair of in-phase and quadrature signals (I, Q) is (1, 0); at time B ═ 1 μ s, the inphase and quadrature signal pair (I, Q) is (0, 1); at time C equal to 1.5 μ s, the in-phase and quadrature signal pair (I, Q) is (1, 0). These I/Q pairs are labeled in the constellation diagram (as shown in 4 (d)). We can see that the ZigBee signal has a phase shift change of pi/2 from the time A to the time B and a phase shift change of-pi/2 from the time B to the time C. The Zigbee transmitter may transmit chip "1" with a phase shift of pi/2 and chip "0" with a phase shift of pi/2.
The embodiment of the invention also comprises a physical layer cross-technology communication device, which is used for executing the physical layer cross-technology communication method shown in figure 3; in this embodiment, the device is a ZigBee transmitter.
Referring to fig. 5, an embodiment of the present invention includes a physical layer cross-technology communication method for implementing ZigBee-to-BLE direct communication, which is performed by a BLE receiver, including but not limited to the following steps:
D1. receiving a ZigBee signal;
D2. dividing the ZigBee signal into a plurality of signal segments, wherein the signal segments comprise anti-offset segments;
D3. identifying the law of the anti-offset fragment and determining a decoding algorithm according to the law of the anti-offset fragment;
D4. decoding the ZigBee signal according to the decoding algorithm;
D5. and identifying the decoded ZigBee signal.
In this embodiment, the execution subject is a BLE receiver, and the decoding algorithm is obtained by dividing the ZigBee signal into a plurality of signal segments, where the signal segments include anti-offset segments, and identifying rules of the anti-offset segments; by using the decoding algorithm, the ZigBee symbol can be decoded with very low processing complexity, and meanwhile, high decoding precision is realized.
Specifically, the step D3 of determining a decoding algorithm according to the rule of the anti-migration fragment includes:
D301. checking each signal segment of the ZigBee signal to obtain an anti-offset segment;
D302. acquiring the index, the phase and the quadrant of the anti-offset fragment;
D303. and determining a decoding algorithm according to the index, the phase and the quadrant of the anti-offset fragment.
Referring to figure 6, the receiver reuses a standard BLE receiver to sample ZigBee signals. Since the bandwidth of BLE (1MHz) is half that of ZigBee (2MHz), the sampling interval (1 μ s) of the receiver is twice that of ZigBee receiver (0.5 μ s). We define a segment as the portion of a ZigBee signal corresponding to a 1 us long double chip. In fig. 4(b), we show a segment corresponding to a two-chip "11" in the ZigBee symbol "1". Each ZigBee symbol has 32 chips, and thus there are 16 signal segments (see fig. 7). Furthermore, according to the phase shift characteristic of the ZigBee signal, the phase shift of the chip varies by + -pi/2 every 0.5 mus, and the phase shift of every 1 mus segment is the accumulation of 2 ZigBee chip phase shifts.
In a practical Cross Technology Communication (CTC) system, a sampling offset (denoted as Δ t) is inevitably introduced due to the lack of synchronization between the transmitter and the receiver or distortion of the signal after transmission in the wireless channel. In the presence of Δ t, the phase shift for some fragments is 0, while others are not. In this embodiment, a segment with a phase shift of 0 is defined as an offset resistant segment (ORP). Anti-migration fragments (ORPs) are divided into two types:
(1) total ORP (Full-ORP): the Full-ORP is a fraction of 0 at all times, regardless of whether Δ t <0 or Δ t > 0. Referring to FIG. 7, FIG. 7 shows all full-ORPs (solid box markers) for all ZigBee symbols. Referring to FIG. 8, FIG. 8 shows the 12 th segment of ZigBee symbol "1", namely full-ORP, when Δ t <0 and Δ t >0, the phase shift is 0.
(2) Semi-ORP (Semi-ORP): Semi-ORP is a segment with a phase shift of 0 only when Δ t <0 or Δ t > 0; referring to FIG. 7, FIG. 7 shows some semi-ORPs (solid circle markers) of ZigBee symbols "3" and "11". FIG. 10 shows a segment 15 of ZigBee symbol "3", namely semi-ORP, whose phase shift is 0 when Δ t <0 and positive when Δ t > 0.
FIG. 8 is the 12 th segment of ZigBee symbol "1", belonging to full-ORP, and the phase falling in the second quadrant; fig. 9 is the 12 th segment of the ZigBee symbol "9", also belonging to the full-ORP, and the phase falls in the third quadrant, fig. 10 is the 15 th segment of the ZigBee symbol "3", belonging to the semi-ORP, because its phase shift is 0 only if and when the phase appears at the second quadrant, and fig. 11 is the 15 th segment of the ZigBee symbol "11", also belonging to a semi-ORP, because its phase shift is 0 only if and when the phase falls at the third quadrant.
In the embodiment, a certain rule of full-ORP and semi-ORP is found by observing all fragments of all ZigBee symbols, as shown in Table 1:
TABLE 1 ORP rule
The full-ORP rule is as follows: FIG. 7 shows all full-ORPs (solid box markers) for 16 ZigBee symbols. As can be seen from fig. 7:
(1) ZigBee symbols "3" and "11" have no full-ORP;
(2) besides the two symbols, each other ZigBee symbol has one and only one full-ORP; let Ω be {2,4,6,8,10,12,14}, then:
1. the full-ORP with index i (i ∈ Ω) is associated with two different symbols. For example, the full-ORP with index 2 is associated with the symbols "4" and "12";
2. given a full-ORP with index i (i ∈ Ω), the two different signs associated with it, the quadrant q in which the phase falls at a sampling offset Δ t is different, with q having a value of 2 or 3. For example, as shown in fig. 8 and 9, the segment 12 corresponds to the symbol "1" when q is 2, and corresponds to the symbol "9" when q is 3.
The semiORP rule is as follows: only the symbols "3" and "11" do not have full-ORP. In this example, all segments of symbols "3" and "11" are examined, and segments 15 and 16 are found to be their semi-ORPs (as marked by circles in FIG. 7).
The properties of semi-ORP include:
1. when Δ t <0, the Semi-ORP phase shift of symbols "3" and "11" indexed 15 is 0, but as shown in FIGS. 10 and 11, the phase and quadrant q of the Semi-ORP of symbol "3" is 2, and q of symbol "11" is 3.
2. When Δ t >0, the phase shift of the Semi-ORP indexed by the symbols "3" and "11" is 0, but the phase and quadrant q of the Semi-ORP of the symbol "3" is 2, and q of the symbol "11" is 3.
From fig. 7 and table 1, it can be seen that a ZigBee symbol consisting of n segments can be determined by the index and the quadrant of its unique ORP. Thus, to decode a symbol, the rule-based algorithm proposed in this example only needs to check its n segments at most once to find the ORP and then determine the index i and quadrant q of the ORP. Therefore, the time complexity of the decoding algorithm in this embodiment is o (n).
Referring to FIG. 12, for each received ZigBee symbol, let
A sample set representing a segment thereof (output from the quadrature demodulator module in fig. 6), and instructions to
Representing the phase shift of these segments (the output from the phase shift module in fig. 6). Assuming that the sign of Δ t has been measured (e.g., using the frame header), if Δ t is measured>0 makes x 15, otherwise makes x 16. Algorithm 1 shown in fig. 12 takes C, Δ Φ, and x as inputs (line 2 in fig. 12), and the determined ZigBee symbol index S as output. In this embodiment, the core of the decoding algorithm is how to determine the index i and quadrant q of the ORP ( lines 5 and 6 in fig. 12) and decode the ZigBee symbols (lines 7 to 8 in fig. 12).
For each fragment i e {2,4, …,14, x }, the following steps will be performed in this embodiment:
(1) lines 5 to 6: examine | Δ ΦiIf | is less than a predefined threshold. If less than, use the sample (I)i,Qi) The constellation point of (a) results in quadrant q of segment i.
(2) Lines 7 to 8: if q is 2 or 3, it can be conservatively inferred that segment i is the ORP of a certain ZigBee symbol, since all ORPs only appear in quadrants 2 and 3. Therefore, < i, q > in table 1 is looked up again, and the ZigBee symbol index S can be returned.
Specifically, the step D4, namely the step of decoding the ZigBee signal according to the decoding algorithm, specifically includes:
D401. sampling the received ZigBee signal to obtain a sampling sample;
D402. processing the sampled ZigBee signal to obtain phase shift data;
D403. and decoding the ZigBee signal by using the sampling sample and the phase shift data according to the decoding algorithm.
In this embodiment, the standard BLE module is reused when receiving the ZigBee signal. The core of the receiver is the newly proposed rule-based decoding algorithm. The decoding algorithm can refer to fig. 12, which decodes ZigBee symbols using the phase shift characteristic of ZigBee transmission signals. Referring to fig. 6, the receiver decoding the ZigBee signal mainly includes the steps of:
(1) the receiver re-uses the BLE quadrature demodulator module (as shown in fig. 6 (i)) to sample the received ZigBee signal at intervals of 1 μ s, resulting in a set of sample samples
Wherein (I)i,Qi) Is the ith in-phase and quadrature signal pair;
(2) reusing a BLE phase shift module (as shown in figure 6 (ii)) to obtain a set of phase shifts
Wherein Δ Φi＝∠(Ii+1,Qi+1)-∠(Ii,Qi) Is the ith phase shift, angle (I)i,Qi) Is (I)i,Qi) The phase of (d);
(3) c and delta phi are fed into a newly introduced decoding module based on rules, and the received ZigBee symbol is decoded.
The embodiment of the invention also comprises a physical layer cross-technology communication device, which is used for the physical layer cross-technology communication method shown in fig. 5. In this embodiment, the device is a BLE receiver.
Specifically, the apparatus comprises:
the BLE orthogonal demodulator module is configured to execute step D401, that is, sample the received ZigBee signal to obtain a sample;
and a BLE phase shift module, configured to perform step D402, that is, process the sampled ZigBee signal to obtain phase shift data.
In summary, the physical layer cross-technology communication method described in this embodiment has the following advantages:
the method comprises the steps of dividing a ZigBee signal into a plurality of signal segments, wherein the signal segments comprise anti-offset segments, and identifying the rule of the anti-offset segments to obtain a decoding algorithm; by using the decoding algorithm, the ZigBee symbol can be decoded with very low processing complexity, and meanwhile, very high decoding precision is realized.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Claims (10)
1. A physical layer cross-technology communication method is used for realizing direct communication from ZigBee to BLE, and is characterized by comprising the following steps:
receiving a ZigBee signal;
dividing the ZigBee signal into a plurality of signal segments, wherein the signal segments comprise anti-offset segments;
identifying the law of the anti-offset fragment and determining a decoding algorithm according to the law of the anti-offset fragment;
decoding the ZigBee signal according to the decoding algorithm;
and identifying the decoded ZigBee signal.
2. The inter-technology communication method for physical layer according to claim 1, wherein the step of determining a decoding algorithm according to the law of the anti-migration fragment specifically comprises:
checking each signal segment of the ZigBee signal to obtain an anti-offset segment;
acquiring the index, the phase and the quadrant of the anti-offset fragment;
and determining a decoding algorithm according to the index, the phase and the quadrant of the anti-offset fragment.
3. The inter-physical-layer-technology communication method according to claim 1, wherein the step of decoding the ZigBee signal according to the decoding algorithm specifically comprises:
sampling the received ZigBee signal to obtain a sampling sample;
processing the sampled ZigBee signal to obtain phase shift data;
and decoding the ZigBee signal by using the sampling sample and the phase shift data according to the decoding algorithm.
4. A physical layer cross technology communication apparatus, characterized in that the apparatus is configured to perform the physical layer cross technology communication method of any one of claims 1-3.
5. The physical layer cross-technology communication device of claim 4, wherein the device comprises:
the BLE quadrature demodulator module is used for sampling the received ZigBee signal to obtain a sampling sample;
and the BLE phase shift module is used for processing the sampled ZigBee signal to obtain phase shift data.
6. A method for physical layer cross-technology communication, comprising:
transmitting a ZigBee signal to the device of any one of claims 4-5.
7. The physical layer cross-technology communication method according to claim 6, wherein before transmitting the ZigBee signal to the device according to any one of claims 4-5, the method further comprises:
modulating the ZigBee symbol into a ZigBee signal;
and amplifying the ZigBee signal.
8. The physical layer inter-technology communication method according to claim 7, wherein the step of modulating the ZigBee symbol into the ZigBee signal specifically comprises:
converting the ZigBee symbol into a plurality of chip sequences by adopting a direct sequence spread spectrum technology;
and converting a plurality of the chip sequences into ZigBee signals by adopting an offset quadrature phase shift keying technology.
9. The inter-technology communication method for physical layer according to claim 8, wherein the step of converting the plurality of chip sequences into ZigBee signals by using offset quadrature phase shift keying (qpsk) specifically comprises:
selecting odd chips from the chip sequences to construct an in-phase sequence, and selecting even chips from the chip sequences to construct an orthogonal sequence;
converting the in-phase sequence into an in-phase signal and converting the quadrature sequence into a quadrature signal;
and delaying the orthogonal signal, and combining the delayed orthogonal signal with the in-phase signal to generate the ZigBee signal.
10. A physical layer cross technology communication apparatus, characterized in that the apparatus is configured to perform the physical layer cross technology communication method of any one of claims 6-9.
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